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Long-Term Debt (Narrative) (Details) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended
Aug. 26, 2012
Revolving Credit Agreement
Aug. 26, 2012
Revolving Credit Facility
Revolving Credit Agreement
Aug. 26, 2012
Revolving Credit Facility
Libor
Revolving Credit Agreement
Aug. 26, 2012
Revolving Credit Facility
Base Rate Loans
Revolving Credit Agreement
Aug. 26, 2012
Commercial Paper
Revolving Credit Agreement
Aug. 26, 2012
Letters of Credit
Revolving Credit Agreement
Aug. 28, 2012
Unsecured Notes
3.790% Senior Notes Due August 2019
Issuance of Debt
Aug. 28, 2012
Unsecured Notes
4.520% Senior Notes Due August 2024
Issuance of Debt
Aug. 26, 2012
Senior Notes
adjustments
Aug. 22, 2012
Senior Notes
Term Loan Agreement
Aug. 26, 2012
Senior Notes
5.625% Senior Notes Due October 2012
Aug. 26, 2012
Senior Notes
6.200 Percent Senior Notes Due October 2017
Aug. 26, 2012
Senior Notes
6.800% Senior Notes Due October 2037
Aug. 26, 2012
Maximum
Senior Notes
Maximum borrowing available under the credit facility   $ 750,000,000                        
Total debt to total capitalization ratio   0.75               0.75        
Expiration date of credit facility Oct. 03, 2016                          
Base interest rate percentage of revolving credit facility in addition to federal funds rate   0.50%                        
Applicable interest rate assuming a BBB equivalent credit rating level     1.075% 0.075%                    
Amount outstanding under credit facility   0     245,700,000 8,500,000                
Remaining credit available   495,800,000                        
Face amount of debt             $ 80,000,000 $ 220,000,000   $ 300,000,000 $ 350,000,000 $ 500,000,000 $ 300,000,000  
Interest rate of debt             3.79% 4.52%     5.625% 6.20% 6.80%  
Maturity date of debt                     Oct. 01, 2012 Oct. 01, 2017 Oct. 01, 2037  
Annual amortization of principal second anniversary (percentage)                   5.00%        
Annual amortization of principal third anniversary (percentage)                   5.00%        
Annual amoritzation of principal fourth anniversary (percentage)                   5.00%        
Annual amortization of principal fifth anniversary (percentage)                   85.00%        
Maximum range of interest rate adjustment on funds borrowed                           2.00%
Adjustments made to interest rates on funds borrowed                 0